How to Convert Hz to HP

A few quick calculations and the conversion is complete.
••• Jupiterimages/Polka Dot/Getty Images

The unit hertz (Hz) is a measure of frequency, with 1 hertz indicating that whatever you're measuring occurs once per second; for example, if your computer screen refreshes itself 40 times per second, the refresh rate would be 40 hertz. Horsepower (HP) is a unit of power, the amount of work performed over a period of time. Since these two units don't measure the same thing, they can't be directly converted. However, if you have a certain amount of work occurring at a certain frequency, you can state that in terms of horsepower.

Mechanical Horsepower

    Check that you have a measure of work and a measure of frequency. Work is often measured in foot-pounds (ft-lbs, standard), Joules (J, metric) or Newton-meters (N-m, equivalent to a Joule); frequency is measured in hertz. If your work is measured in foot-pounds, skip to Step 3.

    Convert your work in Joules (or the equivalent Newton-meter) to foot-pounds. Divide the amount of work in Joules by the conversion rate: 1 J = 0.737562149 ft-lbs.

    Convert your work and frequency to power. To do this, take your work (in foot-pounds) and the frequency at which that work occurs (in hertz) and simply multiply the two values together.

    You now have a unit of power called foot-pounds per second (ft-lbs/s). To convert this unit to mechanical horsepower, divide it by the conversion rate: 1 HP = 550 ft-lbs/s


    • Mechanical horsepower is used in the United States and England, but in the rest of Europe, a slightly different unit of measurement called metric horsepower is used. To convert to metric, divide your power in mechanical horsepower by the conversion rate: 1 mechanical HP = 1.01387 metric HP

      There are other types of horsepower for different situations, including boiler horsepower and electric horsepower (see References for more information).

Related Articles

Ace Your Middle School Science Fair with These Science...
How to Convert Hertz to Motor Rpm
Watt Hour Vs. Amp Hour
How to Measure the Ohm Value for an Inductor
How to Convert Hertz to Nanometers
How to Convert Candle Power to Lumens
How to Calculate Peak Torque
How to Calculate the Duty Cycle of a Frequency
How to Design an RC Snubber
How to Calculate KVA to MVA
How to Calculate MBH
How to Convert Hertz to Milliseconds
How to Convert Lumens to Candlepower
How to Convert Kilopascals to Joules
How to Convert Foot-Candles to Lux
How to Calculate Slope Ratio
How do I Convert 8 NS to Hertz?
How to Convert HP to BTU/hr
What Is a Non Linear Relationship?
How to Test Crystal Oscillators